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Evidence-Based Supplement Research
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L-Carnitine and Reduced Total Cholesterol

Research synthesisModerate evidenceMixed effect size3 studies · 2 beneficial · 1 neutral · 0 harmful

Across 3 studies, 2 reported beneficial effects on total cholesterol reduction (1 large, 1 small) and 1 reported a neutral effect. The predominant effect direction is beneficial, but effect sizes are mixed (small to large). The median study duration was 42 days (1 study), and the most-studied populations were clinical (PCOS and type 2 diabetes).

  • Effective dose range: 1–3 g/day
  • Studied populations: people with PCOS, adults with type 2 diabetes

Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. One study found no significant effect in type 2 diabetes, and the beneficial effect in PCOS came from a single RCT. The form used was only reported in one study (l-carnitine); other studies did not specify form, limiting comparability.

Generated May 13, 2026
Doses used in studies
  • L-Carnitine · mg/day: 3,000 (median 3,000, IQR 3,000–3,000) — 1 study
  • g/day: 1 (median 1, IQR 1–1) — 1 study
Time to effect
Median: 6 weeks · IQR 6 weeks–6 weeks · Range 6 weeks–6 weeks — Reported in 1 of 3 studies
3 of 3 papers
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